Tryit Editor v2.9

Edit This Code:
<!DOCTYPE html>
<html>
<body>

<p>Click the button to create two SOURCE elements, and append them to the AUDIO element.</p>

<audio controls id="myAudio" autoplay>
Your browser does not support the audio tag.
</audio><br>

<p id="demo"></p>

<button onclick="myFunction()">Try it</button>

<script>
function myFunction() {
    var x = document.createElement("SOURCE");
    x.setAttribute("src", "horse.mp3");
    x.setAttribute("type", "audio/mpeg");
    document.getElementById("myAudio").appendChild(x);

    var y = document.createElement("SOURCE");
    y.setAttribute("src", "horse.ogg");
    y.setAttribute("type", "audio/ogg");
    document.getElementById("myAudio").appendChild(y);
    document.getElementById("demo").innerHTML = "The audio player now works as it should. Press play to listen to the sound of a horse.";
}
</script>

</body>
</html>